While much is still unknown about kitten pharmacodynamics, in a recent breakthrough researchers at the UncycloProject On Drugs discovered that kittens have an inhibitory action at several of the neurotransmitter reuptake pumps; tiny orange kittens can additionally cause neurotransmitter release after entering the axon terminal. The psychopharmacological jargon for this is that regular-strength kittens "fuck you up", while tiny orange kittens "fuck you up real good", according to the researchers.